Eugene moeeatj



(No Model.)

E. MOREAU.

HAND ROGKDRI-LL.

Paten'wdv MayQ, 1882.

No. 257,739.V

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411 d.. New W H om WWW `C) G N. PETERS. Pnawumgmpw, 'wa-Muga". D. c.

l YUmmm) iSTATESPATIENT OFFICE.

EUGENE MoaEAILoE SAN rEANoISco, cALmoImIA,` AsSIeNoa To o `frEEononE A. STERLING, on SAME PLAGE.

HAND RooK-pRn- L SPECIFICATIONf forming part of Letters Patent No. 257,739, dated May 9, 1882.

i Application tiled September 12, 1881. (No model.)

To all whom it may conccrn:-

. Be it known that I, EUGENE MOREAU, of the city and county of San Francisco, State of California, haveinvented an Improvement in MaohineHand ItoclcDrills; and I hereby declare the following to be a full,clear, and exact description thereof. y t

invention relates to the class of machine hand rock-drills, and more especially to cer-` tain improvements therein, consisting iu the provisionof means for rotating the drill after each blow, andin `certain other details of construction having for their object the simplification of the device. y

The general operation of roch-drills of this o class consistsin the delivery of a forcible blow upon the drill, or upon the head ofthe device which contains the drill, and after such blow in rotating the drill. These two operations are of similar character and purpose to those employed by workmen who drill rock with a hand-tool and, hammer'.

In the following description and in the drawings I have shown a rock-drill the general construction ot'which, as far as itrelates to the means for delivering the blow, is substantially the same as the rock-drill shown in the drawings and described in the specifications of William I. Stephenson, now i file in the Patent Office, and whose claims were allowed August 3, 1881. I therefore expressly disclaim any invention in the general principle of the striking device here shown, but simply intend to claim certain improvements in construction whereby the machine is rendered more workmanlike.

My invention of means for rotating the drill :springs E, whereby the hammers are thrown forward to deliver the blow, after being drawn by the cams F, upon the cam-shaft G. The foam-shaft is actuated with the crank-handles.

It willbe seen that I have provided the hammers D D with extended slots a, in the rear. :ends of which are journaled rollers b. The cams F revolve through ,the slots a, and by imjpingin'g against the rollersbforce the ham- ;mers backagainst their springs. placing the cams in the slots of the hammer- By thus Shanks, and placing the rollers b in the axis of the hammer `inside the slot, the hammer is `thrown back by the action` of the cam and the spring compressed without any tendencyh f to twist and cause friction when sliding in the guides of the hammer back ofthe roller being firmly Another advantage is that the part and evenly attached on both sides to the front :part or head,its full weight is utilized to do its` share toward the efticacy of the blow. y

At theforward end of the machine is a cross- ;piece, I, through which the drill-holding `rod J passes. This rod islooselyjournaled in suitable boxing in the cross-piece I, so that it maymove forth and baci; therein. Itsinner end is provided with a heacl,K,which receives the impact ot' the hammers. Its outer end is adapted to have secured toit any suitable drill-chuck which may receive and hold a drill.

L is a metal strip lying upon the cross-pieces I and the cross-brace G, and appropriately guided thereon by having caps screwed down upon it, though not tightly enough to prevent l the cross-brace C, and the guide-cap above,

which. form the boxing or journal for the strip. Thus when the hammers draw said strip back..` the springf is compressed, and when the strip is released by the forward stroke of the hammers the spring immediately returns the strip roo to its former position. The forward end of the strip L, on the under side, is provided with an inclined groove, o.

The boxing or journal in the cross-piece I,

v5 through which the drill-holdingrod passes, is

made large enough to contain the following mechanism. I

Upon the rod J,within the boxing,'is a ratchet, t'. This has a feather upon it which fits into corresponding groove in the rod J, whereby said rod may move back and forth and yet be revolved by the revolution of the ratchet. Over this ratchet is a loose sleeve or piece, M, having an upwardly-projecting lug, O. This sleeve is provided with a pawl, nz, which engages with the ratchet i. The lug O ts into the inclined groove o ot' the sliding strip L. When this strip is drawn hack, as before explained, the groove o causes the lug O to travel over to one side, thus causing the sleeve M, with its pawl m, to move around. The pa-wl engages with the ratchet t', and thus revolves the rod I, with its drill. When the strip L is returned by its spring the groove o returns the lug O and sleeve m,and the pawl m slips back over the ratchet without affecting the drill.

In order to hold the drill in place and prevent its return when the pawl m slips back, I have a counter or retaining pan-l, fr, underneath the cross-piece I, which engages ith the ratchet i, and holds the rod J, with its drill, at the point to which it has been fed. By this means the drill is rotated at each stroke ofthe hammers.

It will bc observed that by the movement of the sliding strip L, with its inclined groove, motion is transmittedto the ratchet upon the drill-containing rod J; and I have here shown it as being accomplished by the intermediate 4o device of the loose sleeve M, containing the .pawl m, which engages the ratchet i, and thc pin or lug O, which moves in the groove of the sliding strip. I do not confine myself to this particular device, for it is obvious that any device whereby motion could be transmitted to the ratchet from the grooved sliding strip would here answer. Any device which would con tain a pin to be operated by the groove, and also the actuating-pawl, to which motion would be transmitted from. the pin, would accomplish the result.

Having thus described my invention, what I claim as new, and desire to secure by Letters `Patent, is-

1. In a machine hand-rock drill, the combination and arrangement of the reciprocating hammers D D, having their shanks provided with slots u, the springs E, and the cams F, revolving in said slots a, substantially as herein described.

2. In a machine hand rock-drill having reciprocatinghammersD D, orasingle hammer, and a loosely-journaled drill-containing rod, J, having a head, K, adapted to receive the impact of said hammer or hammers, the combination and arrangement of the feathered ratchet 't' upon the rod J, counter or retaining pawl r, loose sleeve M, with its pawl fm, and lug O, theV sliding strip L, with its inclined groove o, fitting over the lug O, its springf, and downwardlyextending shoulder c, adapted to engage with the shoulders d d upon the hammers D D, or an equivalent device, whereby said strip L is4 drawn back by the operation of the hammers, substantially as and for the purpose herein described.

In witness whereof I have hereunto set my hand.

EUGENE MOREAU.

Witnesses:

WM. F. BOOTH, A. G. LAWRENCE. 

